Generic Name: tasimelteon (tas-i-MEL-tee-on)
Medically reviewed by Drugs.com. Last updated on April 4, 2020.
Commonly used brand name(s)
In the U.S.
Available Dosage Forms:
Therapeutic Class: Central Nervous System Agent
Pharmacologic Class: Melatonin Receptor Agonist
Uses for tasimelteon
Tasimelteon is a melatonin receptor agonist used to treat non-24-hour sleep-wake disorder (Non-24).
Tasimelteon is available only with your doctor's prescription.
Before using tasimelteon
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For tasimelteon, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to tasimelteon or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Appropriate studies have not been performed on the relationship of age to the effects of tasimelteon in the pediatric population. Safety and efficacy have not been established.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of tasimelteon in the elderly. However, elderly patients may be more likely to have side effects after taking tasimelteon.
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Interactions with medicines
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking tasimelteon, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using tasimelteon with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
- St John's Wort
Interactions with food/tobacco/alcohol
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
Proper use of tasimelteon
Take tasimelteon exactly as directed by your doctor. Do not take more of it, do not take it more often, and do not take it for a longer time than your doctor ordered.
Take tasimelteon without food, at the same time every night.
Swallow the capsule whole. Do not crush, break, or chew it.
Keep using tasimelteon for several weeks or months. It may take a while to work in some patients because of individual differences in circadian rhythms (body clock).
The dose of tasimelteon will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of tasimelteon. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
- For oral dosage form (capsules):
- For non-24-hour sleep-wake disorder:
- Adults—20 milligrams (mg) per day, taken before bedtime.
- Children—Use and dose must be determined by your doctor.
- For non-24-hour sleep-wake disorder:
If you miss a dose of tasimelteon, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Ask your healthcare professional how you should dispose of any medicine you do not use.
Precautions while using tasimelteon
It is very important that your doctor check your progress at regular visits. This will allow your doctor to see if the medicine is working properly and to decide if you should continue to take it.
Tasimelteon may cause some people to become drowsy, sleepy, or less alert than they are normally. It is best that some activities before bedtime should be limited after taking tasimelteon.
Since smoking may decrease the treatment effects of tasimelteon, it is best to avoid smoking while you are using it. If you have any questions about this, check with your doctor.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.
Tasimelteon side effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
- Bladder, lower back, or side pain
- bloody or cloudy urine
- difficult, burning, frequent, or painful urination
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Body aches or pain
- chills or fever
- ear congestion
- nasal congestion, runny nose, or sneezing
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
More about tasimelteon
- Side Effects
- During Pregnancy
- Dosage Information
- Drug Interactions
- En Español
- Drug class: miscellaneous anxiolytics, sedatives and hypnotics
- Other brands
Related treatment guides
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.